Rough idle?

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02-24-2016, 11:19 PM

#11

stwarrior23

Thread Starter

Join Date: Feb 2016

Location: Florida

Posts: 24

Quote:

Originally Posted by 66and06stangs

Warrior? Any progress on this? I'm going to look for vacuum leaks again this weekend. I had hoped someone had a spot-on fix but guess not. My car never threw a check engine light either, just an occasional down-rev (what I called it) when coming to a stop.

no i have not found a fix, a mechanic told me it was the motor mounts going bad. but im thinking it is something electronically wrong because yes motor mounts help the roughness but the idle is so low and like you i replaced the cai with my stock one and it did the same thing not as worse but similar so i just put the cai back on. let me know how the vacuum leak goes.

02-24-2016, 11:22 PM

#12

stwarrior23

Thread Starter

Join Date: Feb 2016

Location: Florida

Posts: 24

Quote:

Originally Posted by UltraBlue91'

That's could be an issue, hey why don't you try seafoaming your car? Just a thought. Not too sure about newer stangs but I'm assuming yours has a manifold absolute pressure sensor. That's a crucial sensor in the cars function and if the voltage is off problems will occur, look up the proper voltage for it on your car and test it if you can.

i have seafoamed it and power foamed it to clean any carbon. i did the voltage and that was all clear, im just assuming its something so little and theres so many things it could be that why should i try them all its gonna cost alot of money and theres nothing wrong with the car, no stalling or anything so when it gets to that, ill probably look more into it, just thought maybe someone had an answer here

02-25-2016, 10:10 AM

#13

66and06stangs

2nd Gear Member

Join Date: Jun 2014

Location: Florida

Posts: 304

Motor mounts? I cannot see how that would make the idle drop, but there are things I've never seen I guess. Vacuum or spark is my guess, or some sensor that is needing replaced.

02-25-2016, 10:32 AM

#14

stwarrior23

Thread Starter

Join Date: Feb 2016

Location: Florida

Posts: 24

Quote:

Originally Posted by 66and06stangs

Motor mounts? I cannot see how that would make the idle drop, but there are things I've never seen I guess. Vacuum or spark is my guess, or some sensor that is needing replaced.

yeah im not quite sure but ive done a bunch of stuff and its just not working, since motor mounts are expensive i dont wanna jump to that conclusion. he said its because the vibration is causing the idle to idle low but i think vacuum leak is our best bet right now

02-28-2016, 03:41 PM

#15

Nuke

6th Gear Member

Join Date: Jun 2007

Location: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)

Posts: 16,182

Run a tank or 2 of SeaFoam and replace the fuel filter. I'd even clean the TB 1 more time and go from there.

02-28-2016, 07:24 PM

#16

stwarrior23

Thread Starter

Join Date: Feb 2016

Location: Florida

Posts: 24

Quote:

Originally Posted by Nuke

Run a tank or 2 of SeaFoam and replace the fuel filter. I'd even clean the TB 1 more time and go from there.

i replaced the fuel filter i wanna say 8k ago, do you think i need to again?

02-29-2016, 06:21 AM

#17

66and06stangs

2nd Gear Member

Join Date: Jun 2014

Location: Florida

Posts: 304

A tank of bad gas immediately after a fuel filter could make it so you need another... I'll try the seafoam and new filter option. I have cleaned the TB before, just spraying carb cleaner good enough Nuke? How else would you clean it?

02-29-2016, 08:35 AM

#18

Nuke

6th Gear Member

Join Date: Jun 2007

Location: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)

Posts: 16,182

I tend to clean the TB without removing it but HAVE had the occasion where it required removal to properly clean behind it to resolve an idle problem. You should be able to remove it and reuse the gasket.